Intel Nehalem

Each core in Nehalem will have access to three levels of cache; a 64KB level one cache, along with a low-latency 256KB level two cache will be exclusive to each core, but an 8MB level three cache will be shared between all cores (and this size will vary depending on how many cores the CPU has). The level two cache acts as a buffer between the core and the level three cache, so the third level does not see requests for data from all cores simultaneously. This should help eliminate bottlenecks in performance.

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